Censuses provide population numbers, household or family size and composition, and information on sex and age distribution. They often include other demographic, economic and health-related topics as well. The 1991 Ireland de facto census collected data through face-to-face interviews and self-enumeration on the subjects of housing, household demographics, employment, and education. The census day was April 21, 1991. A 10% sample of households from the census (353,149 individuals) is available through IPUMS International at the University of Minnesota. Dwellings and vacant units are not identified in the microdata sample. Refer to the IPUMS website for guidelines on citing database versions.